State the main differences between acids and bases.

Explanation

### Step-by-Step Text Solution:

**1. Definition of Acids and Bases:**
- Acids are substances that can donate a proton (H⁺ ion) in a chemical reaction.
- Bases are substances that can accept a proton or donate a hydroxide ion (OH⁻) in a chemical reaction.

**2. Taste:**
- Acids have a sour taste. For example, citric acid found in lemons is sour.
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